<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" v-model="isAll" />
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      v-model.trim="content"
      @keyup.enter="add"
    />
  </header>
</template>

<script>
export default {
  props: ["arr"],
  data() {
    return {
      content: "",
    };
  },
  methods: {
    add() {
      if (this.content.length === 0) {
        return alert("请输入内容");
      }
      this.$emit("add", this.content);
      this.content = "";
    },
  },
  computed: {
    isAll: {
      get() {
        return this.arr.length!==0 && this.arr.every(item=>item.isDone)
      },
      set(checked) {
				this.arr.forEach(item=>item.isDone=checked)
			},
    },
  },
};
</script>
